1

Can be significant:
HCTZ can certainly do this! Also contributing can be subtle things like diuretic effects of alcohol or caffeine, even large amounts of licorice! Some forms of hypertension are associated with low K to begin with ("hyper aldosterone states") and are very sensitive to even low doses of HCTZ.
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Potassium is an essential electrolyte, important in the functioning of many organs including the heart, kidneys, muscles, nerves, and digestive system. Deficiency can be caused by diseases such as kidney failure, vomiting, and diarrhea, or by drugs such as diuretics.
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2

You're doing fine...:
You have made excellent progress towards a more healthy lifestyle. Why do you think something may be going wrong? If you had high blood pressire it is now normal. What is your weight goal? Good idea to take a multivitamin, omega 3 oil and vitamin d=3 and b-12. Be sure you continue to follow up with your physician, continue your weight loss/exercise, and please don't get discouraged!
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4

Preservative:
Potassium sorbate is a natural preservative that serves basically the same function as sulfites. It is also used as a flavor enhancer in baby food. Like sulfates, it is "generally regarded as safe" by the fda.
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7

See DASH diet:
Fruits and vegetables are healthy for a variety of reasons and most people need to increase the amounts they eat. I am not aware of specific fruits or vegetables that have more effects on blood pressure. Low sodium and high potassium(high in fruits and vegetables) diet can help BP. The DASH diet (available with simple search on Google) is specific diet proven to lower BP. Best with low salt diet
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10

You're a man:
You're 25 years old. If you are not in a relationship that includes the two of you enjoying mutual satisfaction several times a week, you're going to feel like this. Being able to relieve your own sexual pressure when you're alone is a great gift that can make it possible for you to save the best, and stay healthy, for that one special person. Think about enjoying and make yourself comfortable.
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